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sge_blib.cpp
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sge_blib.cpp
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/*
* SDL Graphics Extension
* Triangles of every sort
*
* Started 000428
*
* License: LGPL v2+ (see the file LICENSE)
* (c)2000-2003 Anders Lindström & Johan E. Thelin
*/
/*********************************************************************
* This library is free software; you can redistribute it and/or *
* modify it under the terms of the GNU Library General Public *
* License as published by the Free Software Foundation; either *
* version 2 of the License, or (at your option) any later version. *
*********************************************************************/
/*
* Written with some help from Johan E. Thelin.
*/
#include "SDL.h"
#include "sge_surface.h"
#include "sge_primitives.h"
#include "sge_blib.h"
#define SWAP(x,y,temp) temp=x;x=y;y=temp
/* Globals used for sge_Update/sge_Lock (defined in sge_surface) */
extern Uint8 _sge_update;
extern Uint8 _sge_lock;
extern Uint8 _sge_alpha_hack;
/* We need some internal functions */
extern void _Line(SDL_Surface *surface, Sint16 x1, Sint16 y1, Sint16 x2, Sint16 y2, Uint32 color);
extern void _LineAlpha(SDL_Surface *Surface, Sint16 x1, Sint16 y1, Sint16 x2, Sint16 y2, Uint32 Color, Uint8 alpha);
extern void _HLine(SDL_Surface *Surface, Sint16 x1, Sint16 x2, Sint16 y, Uint32 Color);
extern void _HLineAlpha(SDL_Surface *Surface, Sint16 x1, Sint16 x2, Sint16 y, Uint32 Color, Uint8 alpha);
extern void callback_alpha_hack(SDL_Surface *surf, Sint16 x, Sint16 y, Uint32 color);
extern void _AALineAlpha(SDL_Surface *dst, Sint16 x1, Sint16 y1, Sint16 x2, Sint16 y2, Uint32 color, Uint8 alpha);
extern void _AAmcLineAlpha(SDL_Surface *dst, Sint16 x1, Sint16 y1, Sint16 x2, Sint16 y2, Uint8 r1, Uint8 g1, Uint8 b1, Uint8 r2, Uint8 g2, Uint8 b2, Uint8 alpha);
/* Macro to inline RGB mapping */
#define MapRGB(format, r, g, b)\
(r >> format->Rloss) << format->Rshift\
| (g >> format->Gloss) << format->Gshift\
| (b >> format->Bloss) << format->Bshift
//==================================================================================
// Draws a horisontal line, fading the colors
//==================================================================================
void _FadedLine(SDL_Surface *dest,Sint16 x1,Sint16 x2,Sint16 y,Uint8 r1,Uint8 g1,Uint8 b1,Uint8 r2,Uint8 g2,Uint8 b2)
{
Sint16 x;
Uint8 t;
/* Fix coords */
if ( x1 > x2 ) {
SWAP(x1,x2,x);
SWAP(r1,r2,t);
SWAP(g1,g2,t);
SWAP(b1,b2,t);
}
/* We use fixedpoint math */
Sint32 R = r1<<16;
Sint32 G = g1<<16;
Sint32 B = b1<<16;
/* Color step value */
Sint32 rstep = Sint32((r2-r1)<<16) / Sint32(x2-x1+1);
Sint32 gstep = Sint32((g2-g1)<<16) / Sint32(x2-x1+1);
Sint32 bstep = Sint32((b2-b1)<<16) / Sint32(x2-x1+1);
/* Clipping */
if(x2<sge_clip_xmin(dest) || x1>sge_clip_xmax(dest) || y<sge_clip_ymin(dest) || y>sge_clip_ymax(dest))
return;
if (x1 < sge_clip_xmin(dest)){
/* Update start colors */
R += (sge_clip_xmin(dest)-x1)*rstep;
G += (sge_clip_xmin(dest)-x1)*gstep;
B += (sge_clip_xmin(dest)-x1)*bstep;
x1 = sge_clip_xmin(dest);
}
if (x2 > sge_clip_xmax(dest))
x2 = sge_clip_xmax(dest);
switch (dest->format->BytesPerPixel) {
case 1: { /* Assuming 8-bpp */
Uint8 *pixel;
Uint8 *row = (Uint8 *)dest->pixels + y*dest->pitch;
for (x = x1; x <= x2; x++){
pixel = row + x;
*pixel = SDL_MapRGB( dest->format, R>>16, G>>16, B>>16 );
R += rstep;
G += gstep;
B += bstep;
}
}
break;
case 2: { /* Probably 15-bpp or 16-bpp */
Uint16 *pixel;
Uint16 *row = (Uint16 *)dest->pixels + y*dest->pitch/2;
for (x = x1; x <= x2; x++){
pixel = row + x;
*pixel = MapRGB( dest->format, R>>16, G>>16, B>>16 );
R += rstep;
G += gstep;
B += bstep;
}
}
break;
case 3: { /* Slow 24-bpp mode, usually not used */
Uint8 *pixel;
Uint8 *row = (Uint8 *)dest->pixels + y*dest->pitch;
Uint8 rshift8=dest->format->Rshift/8;
Uint8 gshift8=dest->format->Gshift/8;
Uint8 bshift8=dest->format->Bshift/8;
for (x = x1; x <= x2; x++){
pixel = row + x*3;
*(pixel+rshift8) = R>>16;
*(pixel+gshift8) = G>>16;
*(pixel+bshift8) = B>>16;
R += rstep;
G += gstep;
B += bstep;
}
}
break;
case 4: { /* Probably 32-bpp */
Uint32 *pixel;
Uint32 *row = (Uint32 *)dest->pixels + y*dest->pitch/4;
for (x = x1; x <= x2; x++){
pixel = row + x;
*pixel = MapRGB( dest->format, R>>16, G>>16, B>>16 );
R += rstep;
G += gstep;
B += bstep;
}
}
break;
}
}
void sge_FadedLine(SDL_Surface *dest,Sint16 x1,Sint16 x2,Sint16 y,Uint8 r1,Uint8 g1,Uint8 b1,Uint8 r2,Uint8 g2,Uint8 b2)
{
if ( SDL_MUSTLOCK(dest) && _sge_lock )
if ( SDL_LockSurface(dest) < 0 )
return;
_FadedLine(dest,x1,x2,y,r1,g1,b1,r2,g2,b2);
if ( SDL_MUSTLOCK(dest) && _sge_lock )
SDL_UnlockSurface(dest);
if(_sge_update!=1){return;}
if ( x1 > x2 )
sge_UpdateRect(dest, x1, y, x1-x2+1, 1);
else
sge_UpdateRect(dest, x1, y, x2-x1+1, 1);
}
//==================================================================================
// Draws a horisontal, textured line
//==================================================================================
void _TexturedLine(SDL_Surface *dest,Sint16 x1,Sint16 x2,Sint16 y,SDL_Surface *source,Sint16 sx1,Sint16 sy1,Sint16 sx2,Sint16 sy2)
{
Sint16 x;
/* Fix coords */
if ( x1 > x2 ) {
SWAP(x1,x2,x);
SWAP(sx1,sx2,x);
SWAP(sy1,sy2,x);
}
/* Fixed point texture starting coords */
Sint32 srcx = sx1<<16;
Sint32 srcy = sy1<<16;
/* Texture coords stepping value */
Sint32 xstep = Sint32((sx2-sx1)<<16) / Sint32(x2-x1+1);
Sint32 ystep = Sint32((sy2-sy1)<<16) / Sint32(x2-x1+1);
/* Clipping */
if(x2<sge_clip_xmin(dest) || x1>sge_clip_xmax(dest) || y<sge_clip_ymin(dest) || y>sge_clip_ymax(dest))
return;
if (x1 < sge_clip_xmin(dest)){
/* Fix texture starting coord */
srcx += (sge_clip_xmin(dest)-x1)*xstep;
srcy += (sge_clip_xmin(dest)-x1)*ystep;
x1 = sge_clip_xmin(dest);
}
if (x2 > sge_clip_xmax(dest))
x2 = sge_clip_xmax(dest);
if(dest->format->BytesPerPixel == source->format->BytesPerPixel){
/* Fast mode. Just copy the pixel */
switch (dest->format->BytesPerPixel) {
case 1: { /* Assuming 8-bpp */
Uint8 *pixel;
Uint8 *row = (Uint8 *)dest->pixels + y*dest->pitch;
for (x = x1; x <= x2; x++){
pixel = row + x;
*pixel = *((Uint8 *)source->pixels + (srcy>>16)*source->pitch + (srcx>>16));
srcx += xstep;
srcy += ystep;
}
}
break;
case 2: { /* Probably 15-bpp or 16-bpp */
Uint16 *pixel;
Uint16 *row = (Uint16 *)dest->pixels + y*dest->pitch/2;
Uint16 pitch = source->pitch/2;
for (x = x1; x <= x2; x++){
pixel = row + x;
*pixel = *((Uint16 *)source->pixels + (srcy>>16)*pitch + (srcx>>16));
srcx += xstep;
srcy += ystep;
}
}
break;
case 3: { /* Slow 24-bpp mode, usually not used */
Uint8 *pixel, *srcpixel;
Uint8 *row = (Uint8 *)dest->pixels + y*dest->pitch;
Uint8 rshift8=dest->format->Rshift/8;
Uint8 gshift8=dest->format->Gshift/8;
Uint8 bshift8=dest->format->Bshift/8;
for (x = x1; x <= x2; x++){
pixel = row + x*3;
srcpixel = (Uint8 *)source->pixels + (srcy>>16)*source->pitch + (srcx>>16)*3;
*(pixel+rshift8) = *(srcpixel+rshift8);
*(pixel+gshift8) = *(srcpixel+gshift8);
*(pixel+bshift8) = *(srcpixel+bshift8);
srcx += xstep;
srcy += ystep;
}
}
break;
case 4: { /* Probably 32-bpp */
Uint32 *pixel;
Uint32 *row = (Uint32 *)dest->pixels + y*dest->pitch/4;
Uint16 pitch = source->pitch/4;
for (x = x1; x <= x2; x++){
pixel = row + x;
*pixel = *((Uint32 *)source->pixels + (srcy>>16)*pitch + (srcx>>16));
srcx += xstep;
srcy += ystep;
}
}
break;
}
}else{
/* Slow mode. We must translate every pixel color! */
Uint8 r=0,g=0,b=0;
switch (dest->format->BytesPerPixel) {
case 1: { /* Assuming 8-bpp */
Uint8 *pixel;
Uint8 *row = (Uint8 *)dest->pixels + y*dest->pitch;
for (x = x1; x <= x2; x++){
pixel = row + x;
SDL_GetRGB(sge_GetPixel(source, srcx>>16, srcy>>16), source->format, &r, &g, &b);
*pixel = SDL_MapRGB( dest->format, r, g, b );
srcx += xstep;
srcy += ystep;
}
}
break;
case 2: { /* Probably 15-bpp or 16-bpp */
Uint16 *pixel;
Uint16 *row = (Uint16 *)dest->pixels + y*dest->pitch/2;
for (x = x1; x <= x2; x++){
pixel = row + x;
SDL_GetRGB(sge_GetPixel(source, srcx>>16, srcy>>16), source->format, &r, &g, &b);
*pixel = MapRGB( dest->format, r, g, b );
srcx += xstep;
srcy += ystep;
}
}
break;
case 3: { /* Slow 24-bpp mode, usually not used */
Uint8 *pixel, *srcpixel;
Uint8 *row = (Uint8 *)dest->pixels + y*dest->pitch;
Uint8 rshift8=dest->format->Rshift/8;
Uint8 gshift8=dest->format->Gshift/8;
Uint8 bshift8=dest->format->Bshift/8;
for (x = x1; x <= x2; x++){
pixel = row + x*3;
srcpixel = (Uint8 *)source->pixels + (srcy>>16)*source->pitch + (srcx>>16)*3;
SDL_GetRGB(sge_GetPixel(source, srcx>>16, srcy>>16), source->format, &r, &g, &b);
*(pixel+rshift8) = r;
*(pixel+gshift8) = g;
*(pixel+bshift8) = b;
srcx += xstep;
srcy += ystep;
}
}
break;
case 4: { /* Probably 32-bpp */
Uint32 *pixel;
Uint32 *row = (Uint32 *)dest->pixels + y*dest->pitch/4;
for (x = x1; x <= x2; x++){
pixel = row + x;
SDL_GetRGB(sge_GetPixel(source, srcx>>16, srcy>>16), source->format, &r, &g, &b);
*pixel = MapRGB( dest->format, r, g, b );
srcx += xstep;
srcy += ystep;
}
}
break;
}
}
}
void sge_TexturedLine(SDL_Surface *dest,Sint16 x1,Sint16 x2,Sint16 y,SDL_Surface *source,Sint16 sx1,Sint16 sy1,Sint16 sx2,Sint16 sy2)
{
if ( SDL_MUSTLOCK(dest) && _sge_lock )
if ( SDL_LockSurface(dest) < 0 )
return;
if ( SDL_MUSTLOCK(source) && _sge_lock )
if ( SDL_LockSurface(source) < 0 )
return;
_TexturedLine(dest,x1,x2,y,source,sx1,sy1,sx2,sy2);
if ( SDL_MUSTLOCK(dest) && _sge_lock )
SDL_UnlockSurface(dest);
if ( SDL_MUSTLOCK(source) && _sge_lock )
SDL_UnlockSurface(source);
if(_sge_update!=1){return;}
if ( x1 > x2 )
sge_UpdateRect(dest, x1, y, x1-x2+1, 1);
else
sge_UpdateRect(dest, x1, y, x2-x1+1, 1);
}
//==================================================================================
// Draws a trigon
//==================================================================================
void sge_Trigon(SDL_Surface *dest,Sint16 x1,Sint16 y1,Sint16 x2,Sint16 y2,Sint16 x3,Sint16 y3,Uint32 color)
{
if ( SDL_MUSTLOCK(dest) && _sge_lock )
if ( SDL_LockSurface(dest) < 0 )
return;
_Line(dest,x1,y1,x2,y2,color);
_Line(dest,x1,y1,x3,y3,color);
_Line(dest,x3,y3,x2,y2,color);
if ( SDL_MUSTLOCK(dest) && _sge_lock )
SDL_UnlockSurface(dest);
if(_sge_update!=1){return;}
Sint16 xmax=x1, ymax=y1, xmin=x1, ymin=y1;
xmax= (xmax>x2)? xmax : x2; ymax= (ymax>y2)? ymax : y2;
xmin= (xmin<x2)? xmin : x2; ymin= (ymin<y2)? ymin : y2;
xmax= (xmax>x3)? xmax : x3; ymax= (ymax>y3)? ymax : y3;
xmin= (xmin<x3)? xmin : x3; ymin= (ymin<y3)? ymin : y3;
sge_UpdateRect(dest, xmin, ymin, xmax-xmin+1, ymax-ymin+1);
}
void sge_Trigon(SDL_Surface *dest,Sint16 x1,Sint16 y1,Sint16 x2,Sint16 y2,Sint16 x3,Sint16 y3,Uint8 R, Uint8 G, Uint8 B)
{
sge_Trigon(dest,x1,y1,x2,y2,x3,y3, SDL_MapRGB(dest->format, R,G,B));
}
//==================================================================================
// Draws a trigon (alpha)
//==================================================================================
void sge_TrigonAlpha(SDL_Surface *dest,Sint16 x1,Sint16 y1,Sint16 x2,Sint16 y2,Sint16 x3,Sint16 y3,Uint32 color, Uint8 alpha)
{
if ( SDL_MUSTLOCK(dest) && _sge_lock )
if ( SDL_LockSurface(dest) < 0 )
return;
_LineAlpha(dest,x1,y1,x2,y2,color,alpha);
_LineAlpha(dest,x1,y1,x3,y3,color,alpha);
_LineAlpha(dest,x3,y3,x2,y2,color,alpha);
if ( SDL_MUSTLOCK(dest) && _sge_lock )
SDL_UnlockSurface(dest);
if(_sge_update!=1){return;}
Sint16 xmax=x1, ymax=y1, xmin=x1, ymin=y1;
xmax= (xmax>x2)? xmax : x2; ymax= (ymax>y2)? ymax : y2;
xmin= (xmin<x2)? xmin : x2; ymin= (ymin<y2)? ymin : y2;
xmax= (xmax>x3)? xmax : x3; ymax= (ymax>y3)? ymax : y3;
xmin= (xmin<x3)? xmin : x3; ymin= (ymin<y3)? ymin : y3;
sge_UpdateRect(dest, xmin, ymin, xmax-xmin+1, ymax-ymin+1);
}
void sge_TrigonAlpha(SDL_Surface *dest,Sint16 x1,Sint16 y1,Sint16 x2,Sint16 y2,Sint16 x3,Sint16 y3,Uint8 R, Uint8 G, Uint8 B, Uint8 alpha)
{
sge_TrigonAlpha(dest,x1,y1,x2,y2,x3,y3, SDL_MapRGB(dest->format, R,G,B), alpha);
}
//==================================================================================
// Draws an AA trigon (alpha)
//==================================================================================
void sge_AATrigonAlpha(SDL_Surface *dest,Sint16 x1,Sint16 y1,Sint16 x2,Sint16 y2,Sint16 x3,Sint16 y3,Uint32 color, Uint8 alpha)
{
if ( SDL_MUSTLOCK(dest) && _sge_lock )
if ( SDL_LockSurface(dest) < 0 )
return;
_AALineAlpha(dest,x1,y1,x2,y2,color,alpha);
_AALineAlpha(dest,x1,y1,x3,y3,color,alpha);
_AALineAlpha(dest,x3,y3,x2,y2,color,alpha);
if ( SDL_MUSTLOCK(dest) && _sge_lock )
SDL_UnlockSurface(dest);
if(_sge_update!=1){return;}
Sint16 xmax=x1, ymax=y1, xmin=x1, ymin=y1;
xmax= (xmax>x2)? xmax : x2; ymax= (ymax>y2)? ymax : y2;
xmin= (xmin<x2)? xmin : x2; ymin= (ymin<y2)? ymin : y2;
xmax= (xmax>x3)? xmax : x3; ymax= (ymax>y3)? ymax : y3;
xmin= (xmin<x3)? xmin : x3; ymin= (ymin<y3)? ymin : y3;
sge_UpdateRect(dest, xmin, ymin, xmax-xmin+1, ymax-ymin+1);
}
void sge_AATrigonAlpha(SDL_Surface *dest,Sint16 x1,Sint16 y1,Sint16 x2,Sint16 y2,Sint16 x3,Sint16 y3,Uint8 R, Uint8 G, Uint8 B, Uint8 alpha)
{
sge_AATrigonAlpha(dest,x1,y1,x2,y2,x3,y3, SDL_MapRGB(dest->format, R,G,B), alpha);
}
void sge_AATrigon(SDL_Surface *dest,Sint16 x1,Sint16 y1,Sint16 x2,Sint16 y2,Sint16 x3,Sint16 y3,Uint32 color)
{
sge_AATrigonAlpha(dest,x1,y1,x2,y2,x3,y3, color, 255);
}
void sge_AATrigon(SDL_Surface *dest,Sint16 x1,Sint16 y1,Sint16 x2,Sint16 y2,Sint16 x3,Sint16 y3,Uint8 R, Uint8 G, Uint8 B)
{
sge_AATrigonAlpha(dest,x1,y1,x2,y2,x3,y3, SDL_MapRGB(dest->format, R,G,B), 255);
}
//==================================================================================
// Draws a filled trigon
//==================================================================================
void sge_FilledTrigon(SDL_Surface *dest,Sint16 x1,Sint16 y1,Sint16 x2,Sint16 y2,Sint16 x3,Sint16 y3,Uint32 color)
{
Sint16 y;
if( y1==y3 )
return;
/* Sort coords */
if ( y1 > y2 ) {
SWAP(y1,y2,y);
SWAP(x1,x2,y);
}
if ( y2 > y3 ) {
SWAP(y2,y3,y);
SWAP(x2,x3,y);
}
if ( y1 > y2 ) {
SWAP(y1,y2,y);
SWAP(x1,x2,y);
}
/*
* How do we calculate the starting and ending x coordinate of the horizontal line
* on each y coordinate? We can do this by using a standard line algorithm but
* instead of plotting pixels, use the x coordinates as start and stop
* coordinates for the horizontal line.
* So we will simply trace the outlining of the triangle; this will require 3 lines.
* Line 1 is the line between (x1,y1) and (x2,y2)
* Line 2 is the line between (x1,y1) and (x3,y3)
* Line 3 is the line between (x2,y2) and (x3,y3)
*
* We can divide the triangle into 2 halfs. The upper half will be outlined by line
* 1 and 2. The lower half will be outlined by line line 2 and 3.
*/
/* Starting coords for the three lines */
Sint32 xa = Sint32(x1<<16);
Sint32 xb = xa;
Sint32 xc = Sint32(x2<<16);
/* Lines step values */
Sint32 m1 = 0;
Sint32 m2 = Sint32((x3 - x1)<<16)/Sint32(y3 - y1);
Sint32 m3 = 0;
/* Upper half of the triangle */
if( y1==y2 )
_HLine(dest, x1, x2, y1, color);
else{
m1 = Sint32((x2 - x1)<<16)/Sint32(y2 - y1);
for ( y = y1; y <= y2; y++) {
_HLine(dest, xa>>16, xb>>16, y, color);
xa += m1;
xb += m2;
}
}
/* Lower half of the triangle */
if( y2==y3 )
_HLine(dest, x2, x3, y2, color);
else{
m3 = Sint32((x3 - x2)<<16)/Sint32(y3 - y2);
for ( y = y2+1; y <= y3; y++) {
_HLine(dest, xb>>16, xc>>16, y, color);
xb += m2;
xc += m3;
}
}
if(_sge_update!=1){return;}
Sint16 xmax=x1, xmin=x1;
xmax= (xmax>x2)? xmax : x2;
xmin= (xmin<x2)? xmin : x2;
xmax= (xmax>x3)? xmax : x3;
xmin= (xmin<x3)? xmin : x3;
sge_UpdateRect(dest, xmin, y1, xmax-xmin+1, y3-y1+1);
}
void sge_FilledTrigon(SDL_Surface *dest,Sint16 x1,Sint16 y1,Sint16 x2,Sint16 y2,Sint16 x3,Sint16 y3,Uint8 R, Uint8 G, Uint8 B)
{
sge_FilledTrigon(dest,x1,y1,x2,y2,x3,y3, SDL_MapRGB(dest->format, R,G,B));
}
//==================================================================================
// Draws a filled trigon (alpha)
//==================================================================================
void sge_FilledTrigonAlpha(SDL_Surface *dest,Sint16 x1,Sint16 y1,Sint16 x2,Sint16 y2,Sint16 x3,Sint16 y3,Uint32 color, Uint8 alpha)
{
Sint16 y;
if( y1==y3 )
return;
/* Sort coords */
if ( y1 > y2 ) {
SWAP(y1,y2,y);
SWAP(x1,x2,y);
}
if ( y2 > y3 ) {
SWAP(y2,y3,y);
SWAP(x2,x3,y);
}
if ( y1 > y2 ) {
SWAP(y1,y2,y);
SWAP(x1,x2,y);
}
Sint32 xa = Sint32(x1<<16);
Sint32 xb = xa;
Sint32 xc = Sint32(x2<<16);
Sint32 m1 = 0;
Sint32 m2 = Sint32((x3 - x1)<<16)/Sint32(y3 - y1);
Sint32 m3 = 0;
if ( SDL_MUSTLOCK(dest) && _sge_lock )
if ( SDL_LockSurface(dest) < 0 )
return;
/* Upper half of the triangle */
if( y1==y2 )
_HLineAlpha(dest, x1, x2, y1, color, alpha);
else{
m1 = Sint32((x2 - x1)<<16)/Sint32(y2 - y1);
for ( y = y1; y <= y2; y++) {
_HLineAlpha(dest, xa>>16, xb>>16, y, color, alpha);
xa += m1;
xb += m2;
}
}
/* Lower half of the triangle */
if( y2==y3 )
_HLineAlpha(dest, x2, x3, y2, color, alpha);
else{
m3 = Sint32((x3 - x2)<<16)/Sint32(y3 - y2);
for ( y = y2+1; y <= y3; y++) {
_HLineAlpha(dest, xb>>16, xc>>16, y, color, alpha);
xb += m2;
xc += m3;
}
}
if ( SDL_MUSTLOCK(dest) && _sge_lock )
SDL_UnlockSurface(dest);
if(_sge_update!=1){return;}
Sint16 xmax=x1, xmin=x1;
xmax= (xmax>x2)? xmax : x2;
xmin= (xmin<x2)? xmin : x2;
xmax= (xmax>x3)? xmax : x3;
xmin= (xmin<x3)? xmin : x3;
sge_UpdateRect(dest, xmin, y1, xmax-xmin+1, y3-y1+1);
}
void sge_FilledTrigonAlpha(SDL_Surface *dest,Sint16 x1,Sint16 y1,Sint16 x2,Sint16 y2,Sint16 x3,Sint16 y3,Uint8 R, Uint8 G, Uint8 B, Uint8 alpha)
{
sge_FilledTrigonAlpha(dest,x1,y1,x2,y2,x3,y3, SDL_MapRGB(dest->format, R,G,B),alpha);
}
//==================================================================================
// Draws a gourand shaded trigon
//==================================================================================
void sge_FadedTrigon(SDL_Surface *dest,Sint16 x1,Sint16 y1,Sint16 x2,Sint16 y2,Sint16 x3,Sint16 y3,Uint32 c1,Uint32 c2,Uint32 c3)
{
Sint16 y;
if( y1==y3 )
return;
Uint8 c=0;
SDL_Color col1;
SDL_Color col2;
SDL_Color col3;
col1 = sge_GetRGB(dest,c1);
col2 = sge_GetRGB(dest,c2);
col3 = sge_GetRGB(dest,c3);
/* Sort coords */
if ( y1 > y2 ) {
SWAP(y1,y2,y);
SWAP(x1,x2,y);
SWAP(col1.r,col2.r,c);
SWAP(col1.g,col2.g,c);
SWAP(col1.b,col2.b,c);
}
if ( y2 > y3 ) {
SWAP(y2,y3,y);
SWAP(x2,x3,y);
SWAP(col2.r,col3.r,c);
SWAP(col2.g,col3.g,c);
SWAP(col2.b,col3.b,c);
}
if ( y1 > y2 ) {
SWAP(y1,y2,y);
SWAP(x1,x2,y);
SWAP(col1.r,col2.r,c);
SWAP(col1.g,col2.g,c);
SWAP(col1.b,col2.b,c);
}
/*
* We trace three lines exactly like in sge_FilledTrigon(), but here we
* must also keep track of the colors. We simply calculate how the color
* will change along the three lines.
*/
/* Starting coords for the three lines */
Sint32 xa = Sint32(x1<<16);
Sint32 xb = xa;
Sint32 xc = Sint32(x2<<16);
/* Starting colors (rgb) for the three lines */
Sint32 r1 = Sint32(col1.r<<16);
Sint32 r2 = r1;
Sint32 r3 = Sint32(col2.r<<16);
Sint32 g1 = Sint32(col1.g<<16);
Sint32 g2 = g1;
Sint32 g3 = Sint32(col2.g<<16);
Sint32 b1 = Sint32(col1.b<<16);
Sint32 b2 = b1;
Sint32 b3 = Sint32(col2.b<<16);
/* Lines step values */
Sint32 m1 = 0;
Sint32 m2 = Sint32((x3 - x1)<<16)/Sint32(y3 - y1);
Sint32 m3 = 0;
/* Colors step values */
Sint32 rstep1 = 0;
Sint32 rstep2 = Sint32((col3.r - col1.r) << 16) / Sint32(y3 - y1);
Sint32 rstep3 = 0;
Sint32 gstep1 = 0;
Sint32 gstep2 = Sint32((col3.g - col1.g) << 16) / Sint32(y3 - y1);
Sint32 gstep3 = 0;
Sint32 bstep1 = 0;
Sint32 bstep2 = Sint32((col3.b - col1.b) << 16) / Sint32(y3 - y1);
Sint32 bstep3 = 0;
if ( SDL_MUSTLOCK(dest) && _sge_lock )
if ( SDL_LockSurface(dest) < 0 )
return;
/* Upper half of the triangle */
if( y1==y2 )
_FadedLine(dest, x1, x2, y1, col1.r, col1.g, col1.b, col2.r, col2.g, col2.b);
else{
m1 = Sint32((x2 - x1)<<16)/Sint32(y2 - y1);
rstep1 = Sint32((col2.r - col1.r) << 16) / Sint32(y2 - y1);
gstep1 = Sint32((col2.g - col1.g) << 16) / Sint32(y2 - y1);
bstep1 = Sint32((col2.b - col1.b) << 16) / Sint32(y2 - y1);
for ( y = y1; y <= y2; y++) {
_FadedLine(dest, xa>>16, xb>>16, y, r1>>16, g1>>16, b1>>16, r2>>16, g2>>16, b2>>16);
xa += m1;
xb += m2;
r1 += rstep1;
g1 += gstep1;
b1 += bstep1;
r2 += rstep2;
g2 += gstep2;
b2 += bstep2;
}
}
/* Lower half of the triangle */
if( y2==y3 )
_FadedLine(dest, x2, x3, y2, col2.r, col2.g, col2.b, col3.r, col3.g, col3.b);
else{
m3 = Sint32((x3 - x2)<<16)/Sint32(y3 - y2);
rstep3 = Sint32((col3.r - col2.r) << 16) / Sint32(y3 - y2);
gstep3 = Sint32((col3.g - col2.g) << 16) / Sint32(y3 - y2);
bstep3 = Sint32((col3.b - col2.b) << 16) / Sint32(y3 - y2);
for ( y = y2+1; y <= y3; y++) {
_FadedLine(dest, xb>>16, xc>>16, y, r2>>16, g2>>16, b2>>16, r3>>16, g3>>16, b3>>16);
xb += m2;
xc += m3;
r2 += rstep2;
g2 += gstep2;
b2 += bstep2;
r3 += rstep3;
g3 += gstep3;
b3 += bstep3;
}
}
if ( SDL_MUSTLOCK(dest) && _sge_lock )
SDL_UnlockSurface(dest);
if(_sge_update!=1){return;}
Sint16 xmax=x1, xmin=x1;
xmax= (xmax>x2)? xmax : x2;
xmin= (xmin<x2)? xmin : x2;
xmax= (xmax>x3)? xmax : x3;
xmin= (xmin<x3)? xmin : x3;
sge_UpdateRect(dest, xmin, y1, xmax-xmin+1, y3-y1+1);
}
//==================================================================================
// Draws a texured trigon (fast)
//==================================================================================
void sge_TexturedTrigon(SDL_Surface *dest,Sint16 x1,Sint16 y1,Sint16 x2,Sint16 y2,Sint16 x3,Sint16 y3,SDL_Surface *source,Sint16 sx1,Sint16 sy1,Sint16 sx2,Sint16 sy2,Sint16 sx3,Sint16 sy3)
{
Sint16 y;
if( y1==y3 )
return;
/* Sort coords */
if ( y1 > y2 ) {
SWAP(y1,y2,y);
SWAP(x1,x2,y);
SWAP(sx1,sx2,y);
SWAP(sy1,sy2,y);
}
if ( y2 > y3 ) {
SWAP(y2,y3,y);
SWAP(x2,x3,y);
SWAP(sx2,sx3,y);
SWAP(sy2,sy3,y);
}
if ( y1 > y2 ) {
SWAP(y1,y2,y);
SWAP(x1,x2,y);
SWAP(sx1,sx2,y);
SWAP(sy1,sy2,y);
}
/*
* Again we do the same thing as in sge_FilledTrigon(). But here we must keep track of how the
* texture coords change along the lines.
*/
/* Starting coords for the three lines */
Sint32 xa = Sint32(x1<<16);
Sint32 xb = xa;
Sint32 xc = Sint32(x2<<16);
/* Lines step values */
Sint32 m1 = 0;
Sint32 m2 = Sint32((x3 - x1)<<16)/Sint32(y3 - y1);
Sint32 m3 = 0;
/* Starting texture coords for the three lines */
Sint32 srcx1 = Sint32(sx1<<16);
Sint32 srcx2 = srcx1;
Sint32 srcx3 = Sint32(sx2<<16);
Sint32 srcy1 = Sint32(sy1<<16);
Sint32 srcy2 = srcy1;
Sint32 srcy3 = Sint32(sy2<<16);
/* Texture coords stepping value */
Sint32 xstep1 = 0;
Sint32 xstep2 = Sint32((sx3 - sx1) << 16) / Sint32(y3 - y1);
Sint32 xstep3 = 0;
Sint32 ystep1 = 0;
Sint32 ystep2 = Sint32((sy3 - sy1) << 16) / Sint32(y3 - y1);
Sint32 ystep3 = 0;
if ( SDL_MUSTLOCK(dest) && _sge_lock )
if ( SDL_LockSurface(dest) < 0 )
return;
if ( SDL_MUSTLOCK(source) && _sge_lock )
if ( SDL_LockSurface(source) < 0 )
return;
/* Upper half of the triangle */
if( y1==y2 )
_TexturedLine(dest,x1,x2,y1,source,sx1,sy1,sx2,sy2);
else{
m1 = Sint32((x2 - x1)<<16)/Sint32(y2 - y1);
xstep1 = Sint32((sx2 - sx1) << 16) / Sint32(y2 - y1);
ystep1 = Sint32((sy2 - sy1) << 16) / Sint32(y2 - y1);
for ( y = y1; y <= y2; y++) {
_TexturedLine(dest, xa>>16, xb>>16, y, source, srcx1>>16, srcy1>>16, srcx2>>16, srcy2>>16);
xa += m1;
xb += m2;
srcx1 += xstep1;
srcx2 += xstep2;
srcy1 += ystep1;
srcy2 += ystep2;
}
}
/* Lower half of the triangle */
if( y2==y3 )
_TexturedLine(dest,x2,x3,y2,source,sx2,sy2,sx3,sy3);
else{
m3 = Sint32((x3 - x2)<<16)/Sint32(y3 - y2);
xstep3 = Sint32((sx3 - sx2) << 16) / Sint32(y3 - y2);
ystep3 = Sint32((sy3 - sy2) << 16) / Sint32(y3 - y2);
for ( y = y2+1; y <= y3; y++) {
_TexturedLine(dest, xb>>16, xc>>16, y, source, srcx2>>16, srcy2>>16, srcx3>>16, srcy3>>16);
xb += m2;
xc += m3;
srcx2 += xstep2;
srcx3 += xstep3;
srcy2 += ystep2;
srcy3 += ystep3;
}
}
if ( SDL_MUSTLOCK(dest) && _sge_lock )
SDL_UnlockSurface(dest);
if ( SDL_MUSTLOCK(source) && _sge_lock )
SDL_UnlockSurface(source);
if(_sge_update!=1){return;}
Sint16 xmax=x1, xmin=x1;
xmax= (xmax>x2)? xmax : x2;
xmin= (xmin<x2)? xmin : x2;
xmax= (xmax>x3)? xmax : x3;
xmin= (xmin<x3)? xmin : x3;
sge_UpdateRect(dest, xmin, y1, xmax-xmin+1, y3-y1+1);
}
//==================================================================================
// Draws a texured *RECTANGLE*
//==================================================================================
void sge_TexturedRect(SDL_Surface *dest,Sint16 x1,Sint16 y1,Sint16 x2,Sint16 y2,Sint16 x3,Sint16 y3,Sint16 x4,Sint16 y4,SDL_Surface *source,Sint16 sx1,Sint16 sy1,Sint16 sx2,Sint16 sy2,Sint16 sx3,Sint16 sy3,Sint16 sx4,Sint16 sy4)
{
Sint16 y;
if( y1==y3 || y1 == y4 || y4 == y2 )
return;
/* Sort the coords */
if ( y1 > y2 ) {
SWAP(x1,x2,y);
SWAP(y1,y2,y);
SWAP(sx1,sx2,y);
SWAP(sy1,sy2,y);
}
if ( y2 > y3 ) {
SWAP(x3,x2,y);
SWAP(y3,y2,y);
SWAP(sx3,sx2,y);
SWAP(sy3,sy2,y);
}
if ( y1 > y2 ) {
SWAP(x1,x2,y);